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Video code-flow gamma characteristic correction method and multi-point control unit

A multi-point control unit, gamma technology, applied in TV, electrical components, video conference systems, etc., can solve problems such as gamma distortion, and achieve the effect of improving quality and user experience

Active Publication Date: 2006-10-25
HUAWEI TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0044] The present invention provides a video code stream gamma characteristic correction method and a multi-point control unit in video communication to solve the problem of gamma distortion of video images in existing multimedia communication

Method used

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  • Video code-flow gamma characteristic correction method and multi-point control unit
  • Video code-flow gamma characteristic correction method and multi-point control unit
  • Video code-flow gamma characteristic correction method and multi-point control unit

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0151] Embodiment 1. Gamma correction in the free viewing state of the venue

[0152] In this case, the MCU does not process the video code stream from the terminal, but just forwards it. Assuming that terminal A chooses to freely watch the video of terminal B, terminal B sends a local video code stream to the MCU after joining the video conference. The video code stream carries the Gamma characteristic parameters of terminal B. Assume that terminal B has B A Gamma link; the MCU forwards the video stream from terminal B to terminal A;

[0153] Terminal A receives and analyzes the video code stream from terminal B, extracts the Gamma characteristic parameters and digital video data carried from the video code stream, and performs correction in combination with the Gamma characteristic parameters of terminal A itself. The specific correction method is the aforementioned general correction method, the correction principle is as Figure 11 As shown, the calibration process inclu...

Embodiment 2

[0162] Embodiment 2, Gamma correction under the state of designated viewing (that is, broadcasting at the venue) at the venue

[0163] Same as the first embodiment, the MCU only broadcasts the video code stream from the designated viewing terminal to all the terminals participating in the conference without performing any other processing.

[0164] like Figure 12 As shown in the figure, assume that the broadcasted venue terminal is X, and all other terminals receive the video of X, and any other terminal Y1, Y2...Ym must be based on the Gamma carried by the video stream from X Parameter information, Gamma parameters are extracted, and then corrected, the calibration process is the same as that of Embodiment 1.

[0165] The difference from Embodiment 1 is that each terminal watching the X-terminal video is corrected and watched synchronously, which realizes the Gamma correction in the state of designated viewing (that is, broadcasting at the venue).

Embodiment 3

[0166] Embodiment 3: Gamma correction method 1 in multi-picture state, MCU works in the synthesis mode of first decoding and then encoding

[0167] like Figure 13 As shown, the MCU first needs to 1 、X 2 ......X C C (the total number of sub-pictures in the multi-picture layout) sub-picture videos are decompressed and decoded, restored to an uncompressed (Uncompressed) digital video format, and then assembled into a multi-picture image, and then encoded and compressed. During this process, the MCU can perform some processing and Gamma characteristic correction on the restored uncompressed digital video format. The specific method is:

[0168] 1. For MCU from terminal X i (1≤i≤C) video is decompressed and decoded to form an uncompressed digital video format;

[0169] 2. MCU from X i Extract the carried Gamma parameter information from the video code stream;

[0170] 3. According to the extracted Gamma parameters, the MCU forms an equivalent link G according to the cascad...

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PUM

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Abstract

The invention is in use for solving issue of Gamma distortion of video image in current multimedia communication. In the method, receiving terminal carries out primary correction by using Gamma characteristic parameter of the sending terminal carried by video code stream; control unit for multiple points and receiving terminal correct Gamma distortion of video image in steps. Processor of multiple points in control unit for multiple points includes modules: storage module of Gamma characteristic parameter in use for storing Gamma characteristic parameter of the terminal of sending video image; being connected to the storage module of Gamma characteristic parameter, the Gamma characteristic correction module in use for correcting Gamma characteristic in video image based on Gamma characteristic parameter sent from the terminal of sending video image. The invention implements Gamma correction in multimedia communication so as to raise quality of video communication.

Description

technical field [0001] The invention relates to multimedia communication, in particular to a video code stream gamma characteristic correction method and a multipoint control unit in video communication. Background technique [0002] Video communication is currently being widely used with the rapid development of broadband networks. Domestically and internationally, video conferencing and videophone services are becoming basic services on NGN (Next Generation Network, Next Generation Network). Telecom operators in various countries also attach great importance to this market opportunity. It can be expected that in the next few years, video communication services will become an important business growth point for operators. A key issue in developing this type of business is to improve the end-to-end (End-to-end) user experience (UserExperience, or Quality of Experience). In user experience, in addition to network QoS (packet loss, delay, jitter, R factor, etc.) parameters, f...

Claims

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Application Information

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IPC IPC(8): H04N7/14H04N7/15
CPCH04N5/202H04N7/152H04N9/69
Inventor 罗忠
Owner HUAWEI TECH CO LTD
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